Question
4. A hot sun warms the surface of a lake on a calm day. What will happen to the cold water at the bottom of the lake? The cold water at the bottom will rise up and mix with the warm water at the top. The warm water at the top will sink down and mix with the cold water at the bottom. The cold water will remain at the bottom and won't mix very much with the warm water at the top. Both A and B are true.
Solution
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(366 Votos)
Valeska
Especialista · Tutor por 3 anos
Resposta
The cold water will remain at the bottom and won't mix very much with the warm water at the top.
Explicação
## Step 1This problem is about the concept of thermal stratification in bodies of water. Thermal stratification is a phenomenon where different layers of water in a body of water have different temperatures. ## Step 2In this case, the surface of the lake is warmer than the bottom. This is because the sun's heat warms the surface of the lake, while the bottom remains cooler due to its distance from the sun.## Step 3The warmer water at the top is less dense than the cooler water at the bottom. This is because the molecules in the warmer water have more kinetic energy and are therefore less dense.## Step 4The cooler water at the bottom is denser than the warmer water at the top. This is because the molecules in the cooler water have less kinetic energy and are therefore denser.## Step 5Because of this difference in density, the warmer water at the top tends to stay at the top, while the cooler water at the bottom tends to stay at the bottom. This is because the warmer water is less dense and therefore rises, while the cooler water is denser and therefore sinks.## Step 6Therefore, the cold water at the bottom of the lake will remain at the bottom and won't mix very much with the warm water at the top.